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Serenity Operating System
1/*
2 * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
3 * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
4 *
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8#include <Kernel/Devices/DeviceManagement.h>
9#include <Kernel/FileSystem/DevPtsFS/FileSystem.h>
10#include <Kernel/FileSystem/DevPtsFS/Inode.h>
11#include <Kernel/TTY/SlavePTY.h>
12#include <Kernel/Time/TimeManagement.h>
13
14namespace Kernel {
15
16ErrorOr<NonnullLockRefPtr<FileSystem>> DevPtsFS::try_create()
17{
18 return TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) DevPtsFS));
19}
20
21DevPtsFS::DevPtsFS() = default;
22DevPtsFS::~DevPtsFS() = default;
23
24ErrorOr<void> DevPtsFS::initialize()
25{
26 m_root_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(*this, 1, nullptr)));
27 m_root_inode->m_metadata.inode = { fsid(), 1 };
28 m_root_inode->m_metadata.mode = 0040555;
29 m_root_inode->m_metadata.uid = 0;
30 m_root_inode->m_metadata.gid = 0;
31 m_root_inode->m_metadata.size = 0;
32 m_root_inode->m_metadata.mtime = TimeManagement::boot_time();
33 return {};
34}
35
36static unsigned inode_index_to_pty_index(InodeIndex inode_index)
37{
38 VERIFY(inode_index > 1);
39 return inode_index.value() - 2;
40}
41
42Inode& DevPtsFS::root_inode()
43{
44 return *m_root_inode;
45}
46
47ErrorOr<NonnullRefPtr<Inode>> DevPtsFS::get_inode(InodeIdentifier inode_id) const
48{
49 if (inode_id.index() == 1)
50 return *m_root_inode;
51
52 unsigned pty_index = inode_index_to_pty_index(inode_id.index());
53 auto* device = DeviceManagement::the().get_device(201, pty_index);
54 VERIFY(device);
55
56 auto inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index(), static_cast<SlavePTY*>(device))));
57 inode->m_metadata.inode = inode_id;
58 inode->m_metadata.size = 0;
59 inode->m_metadata.uid = device->uid();
60 inode->m_metadata.gid = device->gid();
61 inode->m_metadata.mode = 0020600;
62 inode->m_metadata.major_device = device->major();
63 inode->m_metadata.minor_device = device->minor();
64 inode->m_metadata.mtime = TimeManagement::boot_time();
65 return inode;
66}
67
68}